1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/clk/spear/clk.c b/drivers/clk/spear/clk.c
new file mode 100644
index 0000000000..50847cccdf
--- /dev/null
+++ b/drivers/clk/spear/clk.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 ST Microelectronics
+ * Viresh Kumar <vireshk@kernel.org>
+ *
+ * SPEAr clk - Common routines
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/types.h>
+#include "clk.h"
+
+long clk_round_rate_index(struct clk_hw *hw, unsigned long drate,
+		unsigned long parent_rate, clk_calc_rate calc_rate, u8 rtbl_cnt,
+		int *index)
+{
+	unsigned long prev_rate, rate = 0;
+
+	for (*index = 0; *index < rtbl_cnt; (*index)++) {
+		prev_rate = rate;
+		rate = calc_rate(hw, parent_rate, *index);
+		if (drate < rate) {
+			/* previous clock was best */
+			if (*index) {
+				rate = prev_rate;
+				(*index)--;
+			}
+			break;
+		}
+	}
+
+	if ((*index) == rtbl_cnt)
+		(*index)--;
+
+	return rate;
+}